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Zulu time is the military time zone equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone. Learn about the history, description and usage of the military time zones, which are named after the NATO phonetic alphabet letters.
ISO 8601 is an international standard for exchanging and communicating date and time data in a well-defined, unambiguous way. It covers various representations and formats, such as Gregorian calendar dates, 24-hour times, time intervals, and week numbers.
NITFS is a suite of standards for digital-imagery products and image-related products. The current standard that defines NITF 2.1 is the Joint BIIF Profile (JBP), version 2024.1, which superseded MIL-STD-2500C CN2 in June 2024.
Learn how dates and times are written and spoken in the U.S., with different formats for military, civilian, and international use. Compare the U.S. styles with those of other countries and regions.
Learn about the 24-hour clock, the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. See how it is indicated by the hours and minutes passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day.
Date-time group (DTG) is a set of characters used to express date and time in communications messages. Learn how DTG is used in the US Military, with different formats and time zone codes, and see examples of DTG in military messages.
W-Day is the effective day the President takes the adversary decision to prepare for war (unambiguous strategic warning). It is one of the many military designations of days and hours used by NATO and the U.S. military.
A 1951 USAF resolution test chart is a device for measuring optical resolution of imaging systems. It consists of 54 target elements with different spatial frequencies, from 0.250 to 912.3 lp/mm, arranged in a spiral pattern.